I have a map that someone else built for gmod and I'm trying to port it over to Left 4 Dead 2.

I have the original vmf map file, and it points to tons of different sound files, and although I've ripped the original sound files from the workshop item, I can't get my map to find the sound files to play at the appropriate time.

All I hear is the l4d2 ambience that the game doesn't have (like the pistol reverb when I shoot) and none of the map ambience or map trigger sounds.

Where should I put the sound files so that they work, and how do I do it in such a way that when I upload the map to the workshop, it's all bundled together and just works?